Screening or separating machine.



T. J. STURTEVANT. SCREENjNG 0R SEPARATING MACHINE.

APPLlCATlQN FILED JAN- 3.1917- Patented June 12, 1917.

In: Nun/us ncrsus w pummurm, wAsHlNnmN, 6' c.

trains sans ieariir onrnon.

THOMAS JOSEPH STURTEVANT, 0F WELLESLEY, MASSACHUSETTS, ASSIGNOR T0 STURTEVANT MILL COMPANY, A CORPORATION 015 MAINE.

SCREENING 0R SEPARATING. MACHINE.

Application filed January 3, 1917.

This invention relates to certain improve- I ments in that class of inclined. screening or separating machines shown in the Sturte- 1,035,262 and vant U. S. Patents Nos. 1,114,064, and the invention has for its object to improve the efliciency and convenience of machines of this class.

In the present improved machines the screen members are elastically suspended from above the covers of the machines, and on which covers the operating mechanisms for percussively jarring the screen members are mounted. By thus elastically suspendingthe screen members from the covers of the machines great efficiency of operation is afforded simply by lifting the hinged covers, all as will hereinafter more fully appear.

In the accompanying drawing, Figure 1 is a side view of an inclined screening or separating machine embodying the present invention. Fig. 2 is a cross section through the screen box. or casing on line 22, Fig.

ner of mounting one of the elastic suspending springs.

Referring to the drawing, 12 denotes the screen casing which will preferably be of sheet steel, and which is preferably'mounted in an inclined position on frame parts 13 in such a manner that its inclination may be varied. Secured to the upper end of the screen casing 12 is a feed box 14 within which is a rotary screw conveyer, as in the separator of the Sturtevant patents hereinbefore referred'to, said screw conveyer being carried by a shaft 15 provided at one end witha driving pulley 16, and at its opposite end with a pulley 17. The pulley 17 is belted to a pulley 18 on. a shaft 19 Specification of Letters Patent.

Patented June 1.2, 1.971 "3.

Serial no. 140,418.

having bearings in standards 20 mounted at the opposite sides of a hinged cover 21. The shaft 19 is provlded with a second pulley 22 belted to a similar pulley 22 on a being so disposed that the said rollers will engage hammers 25 pivoted to standards 26 mounted on the cover 21, to lift the said hammers at intervals, and said hammers, when released from said arms, will fall by gravity on impact bars 27 which serve to percussively jar or vibrate a screen or screens within the casing 12.

Mounted on the cover 21 are blocks 28 to which are secured flat or plate springs 29 the free ends of which sustain bolts or small rods 30 which pass downward through said cover and through the horizontal flanges of angle brackets 31 attached to the upper parts or edges of elastic side plates 31 by which the screen members are supported. Secured to the plates 31 are angle bars 32 having inwardly extending flanges on which rest the side frame parts 33 of the coarse or scalper screen 34:. The side plates 31 are provided near their lower parts with angle bars 35 the inwardly extending parts of which are provided with studs 36. The edges of the wire cloth for the fine wire mesh screen 37 are clamped between the '1. Fig. 3 is a detail view showing the manhorizontal members of the angle bars 35 and clamping plates 38 and beneath which clamping plates are arranged. screws 39 tapped in lugs 40 secured to the lower edges of the plates 31, so that said wire cloth for the fine wire mesh screen is removably mounted in place, as will be understood.

Attached to the wire mesh clothing for the fine mesh screen are cross plates 4:1 to which are riveted sockets 42 receiving the lower ends of the impact bars 27, said in1- pact bars passing loosely through guides 43 attached to' the coarse or scalpel screen.

34 and also through guides at attached to the cover 21. The plates 41 serve as protection plates for the fine wire mesh screen clothing, so that this fine screen clothing will not be injured by the percussive action of the hammers 25 on the impact bars 27. The protection plates 11 are of slightly lesser length than the width of the fine wire mesh screen clothing. Attached to the ends of the plates ll are smaller elastic plates 45 preferably having slotted connections with the studs 36 on the angle bars 35.

Secured to the cover 21 are relatively rigid hangers 16 provided near their lower ends with bolts 17 extending through the side plates 31 and provided with nuts 18 engaging the inner walls of said side plates, so that said plates, which. will preferably be of steel, may be sprung outward by screwing up said nuts, -for the purpose of stretching the wire mesh screen clothing for the fine screen and holding the same taut. During this stretching or tensioning operation the nuts 49 on the studs 35 may be slightly loosened, and may afterward be tightened when the stretching or tensioning operation has been eiiected.

The cover 21 is provided at its upper end with ears 53 having pivotal connections with similar cars 5 11 mounted on the casing 12, these parts providing a hinge for said cover so that it may be lifted when access to the chamber of said casing or access to the parts supported by said cover may be desired.

From the foregoing it will be understood that the springs 29 mounted on the cover 21 afford means whereby the screen members are resiliently supported from above said cover, so that when the machine is in operation the screen or screens may be percussively jarred in such a manner that the screening operation will be efficiently performed.

I do not claim broadly in this application the combination, in a separator, of a screen member or members yieldingly supporated from the cover of the casing of the separator, and means for percussively arring said screen member or members, as this combination is claimed in my application No. 139,555, filed Dec. 29, 1916.

Neither do I herein claim the construction or combination of parts whereby the wire mesh clothing for the fine screen may be stretched and held taut, as this feature of my invention is claimed in my application No. 1 10, 117, filed simultaneously herewith.

The invention is not to be understood as being limited to the details herein shown, as such details may be varied widely, within the province of mechanical skill, without departing from the scope of the invention as defined by the claims hereunto appended.

Having thus described my invention I claim and desire to secure by Letters Patent:

1. In a separator, the combination with a screen casing provided with a cover, of spring members mounted above and supported by said cover, and one or more screen members suspended in said casing from said spring members.

2. In a separator, the combination with a screen casing provided with a hinged cover, of spring members mounted above and supported by said cover, and one or more screen members suspended in said casing from said spring members.

3. In a separator, the combination with a screen casing provided with a cover, of springs mounted above and supported by said cover, rods sustained by said springs and passing through said cover, side plates supported by said rods, and one or more screen members supported by said side plates.

4. In a separator, the combination with a screen casing provided with a hinged cover, of springs mounted above and supported by said cover, rods sustained by said springs and passing through said cover, side plates supported by said rods and one or more screen members supported by said side plates.

5. In a separator, the combination with a screen casing provided with a cover, of spring members mounted above and Supported by said cover, one or more screen members suspended in said casing from said spring members, and means for percussively jarring said screen member or members.

6. In a separator, the combination with a screen casing provided with a hinged cover, of spring members mounted above and supported by said cover, one or more screen members suspended in said casing from said spring members, and means for percussively jarring said screen member or members.

7. In a separator, the combination with a screen casing provided with a cover, of springs mounted above and supported by said cover, rods sustained by said springs and passing through said cover, side plates supported by said rods, one or more screen members supported by said side plates, and means for percussively jarring said screen member or members.

8. In a separator, the combination with a screen casing provided with a hinged cover, of springs mounted above and supported by said cover, rods sustained by said springs and passing through said cover, side plates supported by said rods, one or more screen members supported by said side plates, and means for percussively jarring said screen member or members.

9. In a separator, the combination with a screen casing provided with a cover, of plate springs mounted above and connected'with said cover and having free ends, rods sustained by the free ends of said springs and passing through said cover, side plates supported by said rods and having inwardly extending flanges, and screen members supported by said flanges.

10. In a separator, the combination With a screen casing provided With a cover, of

plate springs mounted above and connected with said cover and having free ends, rods sustained by the free ends of said springs and passing through said cover, side plates supported by said rods and having inwardly extending flanges, screen members sup- 1o ported by said flanges, and means for percussively jarring said screen members.

In testimony whereof I affix my signature.

THOMAS JOSEPH STURTEVANT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

